Lab-Pedja Class02

lab-pedja/.eslintignore

@@ -0,0 +1,5 @@
+**/node_modules/*
+**/vendor/*
+**/*.min.js
+**/coverage/*
+**/build/*

lab-pedja/.eslintrc.json

@@ -0,0 +1,26 @@
+{
+  "env": {
+    "browser": true,
+    "node": true,
+    "commonjs": true,
+    "jest": true,
+    "es6": true
+  },
+  "globals": {
+    "err": true,
+    "req": true,
+    "res": true,
+    "next": true
+  },
+  "extends": "eslint:recommended",
+  "parserOptions": {
+    "sourceType": "module"
+  },
+  "rules": {
+    "no-console": "off",
+    "indent": [ "error", 2 ],
+    "quotes": ["error", "single", { "allowTemplateLiterals": true }],
+    "comma-dangle": ["error", "always-multiline"],
+    "semi": [ "error", "always" ]
+  }
+}

lab-pedja/.gitignore

@@ -0,0 +1,148 @@
+# Created by https://www.gitignore.io/api/osx,vim,node,linux,windows,visualstudiocode
+
+### Linux ###
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+
+### OSX ###
+*.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### Vim ###
+# swap
+[._]*.s[a-v][a-z]
+[._]*.sw[a-p]
+[._]s[a-v][a-z]
+[._]sw[a-p]
+# session
+Session.vim
+# temporary
+.netrwhist
+# auto-generated tag files
+tags
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+.history
+
+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
+ehthumbs.db
+ehthumbs_vista.db
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# End of https://www.gitignore.io/api/osx,vim,node,linux,windows,visualstudiocode

lab-pedja/README.md

@@ -0,0 +1,17 @@
+![cf](https://i.imgur.com/7v5ASc8.png) 02: Lab Tools and Context
+======
+
+## Feature Tasks
+#### fp Module
+Created in lib/ directory fp.js constains fp module that exports an object.
+fp module has 4 stand alone functions `map`, `filter`, `reduce`, and `slice`.
+
+* Both `fp.map` and `fp.filter` take 2 parameters `(callback, collection)` and will return new Array.
+Map will return array with items multiplied with 2.
+Filter function will return an array of numbers that are higher than 3.
+`callback` parameter has to be a function and `collection` has to be an object. If `fp.map` and `fp.filter` are invoked with not valid arguments exception will be thrown and new TypeError will be printed.
+
+* `fp.reduce` takes three parameters `(callback, initialState, collection)` and returns a sum of all items in collection array.
+If function is invoked with callback argument that is not a function or with initialValue argument that is not a number, exception will be thrown and new TypeError will be printed.
+
+* `fp.slice` takes three parameters `(begin, end, collection)` and returns new array.If function is invoked with `begin` and `end` arguments that are not a number, exception will be thrown and new TypeError will be printed.

lab-pedja/__test__/fp.test.js

@@ -0,0 +1,101 @@
+'use strict';
+
+const fp = require('../lib/fp');
+
+describe('fp.js', () => {
+
+  // testing fp.map function
+  describe('fp.map', () => {
+    test('returns array with items multiplied with 2', () => {
+      expect(fp.map(
+        (num) => num * 2,
+        [0, 1, 2]
+      )).toEqual([0, 2, 4]);
+    });
+
+    test('exception will be thrown if error occurs', () => {
+      expect(
+        () => {
+          fp.map('I\'m not a function ()', [0, 1, 2]);
+      }).toThrow();
+      expect(
+        () => {
+          fp.map(
+            (num) => num * 2,
+            'one'
+          );
+      }).toThrow();
+    });
+  });
+
+  // testing fp.filter function
+  describe('fp.filter', () => {
+    test('return value should be number higher than 3', () => {
+      expect(fp.filter(
+        (num) => num > 3,
+        [1, 2, 3, 4, 5]
+      )).toEqual([4, 5]);
+    });
+
+    test('exception will be thrown if error occurs', () => {
+      expect(
+        () => {
+          fp.filter('I\'m not a function ()', [0, 1, 2]);
+      }).toThrow();
+      expect(
+        () => {
+          fp.filter(
+            (num) => num > 3,
+            'one'
+          );
+      }).toThrow();
+    });
+  });
+
+  // testing fp.reduce function
+  describe('fp.reduce', () => {
+    test('return value should be sum of the collection if callback is adding them', () => {
+      expect(fp.reduce(
+        (accu, curr) => {
+          return accu + curr;
+        },
+        [1, 2, 3],
+        10
+      )).toBe(16);
+    });
+
+    test('exception will be thrown if error occurs', () => {
+      expect(
+        () => {
+          fp.reduce('I\'m not a function ()', [0, 1, 2], 10);
+        }
+      ).toThrow();
+      expect(
+        () => {
+          fp.reduce(
+            (accu, curr) => {
+              return accu + curr;
+            },
+            [0, 1, 2],
+            'someString');
+        }
+      ).toThrow();
+    });
+  });
+
+  //testing fp.slice function
+  describe('fp.slice', () => {
+    test('return new array with first 3 items of an existing array', () => {
+      expect(fp.slice(0, 3, [0, 1, 2, 3, 4])).toEqual([0, 1, 2]);
+    });
+    test('exception will be thrown if error occurs', () => {
+      expect(
+        () => {
+          fp.slice('negaiveNumber', -1, [0, 1, 2])
+        }
+      ).toThrow();
+    });
+
+  });
+
+});

lab-pedja/index.js

@@ -0,0 +1 @@
+'use strict';

lab-pedja/lib/fp.js

@@ -0,0 +1,33 @@
+'use strict';
+
+const fp = module.exports = {};
+
+fp.map = (callback, collection) => {
+  if(typeof callback !== 'function')
+    throw new TypeError('<callback> should be a function');
+  if(typeof collection !== 'object')
+    throw new TypeError('<collection> should be an array like object');
+  return Array.prototype.map.call(collection, callback);
+};
+
+fp.filter = (callback, collection) => {
+  if(typeof callback !== 'function')
+    throw new TypeError('<callback> should be a function');
+  if(typeof collection !== 'object')
+    throw new TypeError('<collection> should be an array like object');
+  return Array.prototype.filter.call(collection, callback);
+};
+
+fp.reduce = (callback, collection, initialValue) => {
+  if(typeof callback !== 'function')
+    throw new TypeError('<callback> is not a function');
+  if(typeof initialValue !== 'number')
+    throw new TypeError('<initialValue> is not a number')
+  return Array.prototype.reduce.call(collection, callback, initialValue);
+};
+
+fp.slice = (begin, end, collection) => {
+  if(typeof begin !== 'number' || typeof end !== 'number' )
+    throw new TypeError('<begin> or <end> argument is not a number');
+  return Array.prototype.slice.call(collection, begin, end);
+};